I have a site that will be used by people in various time zones. On this site, there is a table of information, with one column containing a date and time. To circumvent time zone confusion, I'm going to be displaying all dates in UTC. I want to convey this to the user by tacking it on to the label, in parentheses.
So the question boils down to should I use
Last Accessed (UTC)
Last Accessed (GMT)
Or does it even matter as long as I'm consistent across my site?